And California isn't alone. Last year, Dean Farrell of the University of North Carolina at Chapel Hill made a stunning interactive graphic showing the shrinking state of reservoirs across the western US. Still, California stands out, with its reservoirs at roughly 46% of their total capacity.

Lake San Antonio: Before (September 2001)

Lake San Antonio: After (September 2016)

Together with Lake Nacimiento, Lake San Antonio is key to recharging the aquifers that provide water to Southern Monterey County.

In January, Lake San Antonio sat at just 3% of capacity, according to The Monterey Herald. Engineers call reservoirs that are this decimated "dead pools" because gravity can't draw any water from them at such low quantities.

Lake Berryessa: Before

Lake Berryessa: After

At 1.6 million acre-feet, Lake Berryessa is the largest lake in Napa County. It's currently just above half its capacity.

"We're not where we'd like to be, but we're in much better shape than some areas of the San Joaquin Valley," Roland Sanford, a general manager for the Solano County Water Agency, told The Napa Valley Register in February.